Car-brake.



J. S. MUWHIRTER.

. GAR BRAKE.

APPLICATION FILED SEPT. 30,1908. l Y91 9,746. Patented Apr. 27, 1909.

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I. s. MUWIIIIITER.

GAB. BRAKE, APPLICATION FILED ssPT.so,19o s.

Patented Apr. 27, 1909.

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'nNirEn AsrA'rEs PATENT oEEIcE.

JoHN s. MCwHIETE-E, or NEW YoEHjN. if., AssIeNoE To THE Le. BRILLcoM-PANY, or

. rHILAznELPHIA, PENNSYLVANIA.

. Specification of Letters Patent.

Patented April 27, 1909.

y Appiicationnlea'september so, i908. serial No. 455,536.

lie it known that l, Jol-IN S.,MOWHIRTER, a citizen of the UnitedV States, and a resident of the city, county, and State of NewYork,

To all whom it may concern:

have Invented a new and vuseful Improvey.

nient in Car-Brakes, of whichl the lfollowing is a specification. K

The object of my invention is to provide a brake of this classv which will be suitable for maximum traction trucks by means' of which pressure is applied to the wheels in proportion to the loads carried by them. This object is' accomplished by my invention, one embodiment of which will be described below.

For a more particular description of my invention, reference is to be had to the accompanying drawings forming a part hereof in which: i

Figure 1 is a side elevationo'f proved brake. Fig. 2 is a plan view of the same, only one side of the brake being shown, the other side being substantiallyidentical therewith.

Throughout the various views vof the drawings, similar reference characters designate similar parts. A 'Y I 1 My improved brake 1, is shownona maximum traction truck 2 provided with the usual large driving wheels 3 and small trailing wheels 4 and the conventional sideY frame 5, ltogether with the usual crossing 6 and brace 7 and horizontal lever rest 8. All v these parts of the truck may be ofthe conventional form, aswell as the other parts not shown and described.

My improved brake 1 has the usual horizon'tal leverlO which at its upper end'V is pivoted in the conventional manner to the upright lever 11 which near its lower end is pivoted to a U-shaped lever 12 by means of the pivot 13. This .U-shaped lever is fulcrumed at 14 overthefcrossing 6 and the fulcrum 14 has a' bracket 15 fixed to said crossing.` The U-shaped lever 12 has a downwardly extending arm nearthevtrailing wheels 4 in which 1s a. pivot 16 whichV pivots this lever to a brake shoe holder l17 in which is mounteda suitable brake shoe 18 of the conventional form.

The U-shaped lever' 12 is preferably formed of two parts `which runiparallel or nearly parallel to `each otheron each Vside of the bracket 15 and upright Vlever`11. The

pivots 13 and 16 andthe fulcrum 14 are my implied to the .wheels preferably formed of bolts on which are placed coil springs 19 and lock-nuts 20 so that the part-s will be held in proper relation and that there will be no rattling.

The lower end of the upright lever l1 is provided witha third pivot 22 which connects this upright lever with the eye-bolt 23 which is provided with a lock-nut 24 which has ball-joints 25 with the brake shoe holder 26 which carries the brake shoe 27 that is adapted .to rub against the large driving' wheel 3. The brake shoe holder 26 is supported by a hanger 28 pivoted thereto and pivotally connected with a bracket 29 secured to the brake 7. To avoid complicating the drawings the brake shoe holder 26 placed in tension, the upright lever 11 at its upper e-nd is thrown to the right from the position shownin Fig. 1, thereby causing the pivot 13 to move to the right and the pivot 22 to move to the left. The U- shaped lever then forces the brake shoe 18 against the trailing wheel 4 and the eyebolt 23: forces the brake shoe 27 against the large driving wheel3 and the pressure apby vthe brake shoes is proportionate to the weight carried by the wheels.V

`While I have shown and described one embodiment of my invention, it is evident that it is not restricted thereto, but isbroad lenough to cover all structures that come lwithinthescope of the annexed clalms.

What I claim is:V

l. In a device of the class described, an upright lever, a U-shaped lever connected with said upright lever, and having downwardly ldisposed arms, a brake shoe holder pivoted to one of said` downwardly disposed arms, a second brake shoe holder' and means for support-ing the same, and means for connecting said second brake shoe holder with said upright lever.

2. In 'a device of the class described,ran upright lever, a U-shaped lever pivoted thereto, and fulcrumed to means secured to a car truck,` a brake shoe holder pivotally .connected to said U-shaped lever, a second brakeshoe Vholder and means for supporting the same, eye-bolt connected to said upright lever and a ball and socket joint between Said eye-bolt and said last mentioned brake :1nd socket joint connecting said lust menshoe holder'. l liioned brake shoe holder and :nl eye-bolli, Suid 3.' In L device of the class described, an eye-.bolt being pvotally connected with Suid upright lever, a bracketand means for Supuprlglll' lever.

5 porting 'the same, a U-Shaped lever pvotally Signed nl: the city, county and Starte ol 15 connected with said upright lever and ful- 1 New York, this 29th day of Sept., 1908. crumed to sind bracketzmd a brake Shoe JOHN S. MCVHIRTER. holder connected with one end of Said U- ltnessesz shaped lever, a second brake shoe holder GUS l. ARNoW,

10 and means for supporting the Same, a, bell HARRY RADZINSKY. 

